Hi dgoode
If the fuse is good check for continuity between the fuse and L3 (drive motor terminal)
- If this circuit is open the PCB is bad and must be replaced.
If this is not the issue then it is very possible that there is poor electrical contact between the Touch Pad and the Contact Board.
Before replacing the Keypad Assembly check for a foreign material between the Touch Pad and the Contact Board. Examples of foreign material include grease, cooking residue, moisture, or residue from cleaning agents. Circuit board cleaner or equivalent (available from electronic supply stores) should be used to clean the keypad assembly.
To diagnose the keypad:
1. Disconnect the Keypad Molex plug at the Main PCB and attach leads of an Ohm meter to pins #12 and #13.
2. Push the UP/DOWN button. This must show a closed circuit
If the above test does not show a closed circuit, perform the following.
- Check for grease or any foreign material between the Touch Buttons and the contact board. Clean with an electronic contact cleaner as described above.
- Repeat test above.
- If the contacts are clear, replace the keypad assembly.
- If the circuit is closed, check for 120VAC between contacts N3 and L3 on the main PCB. If voltage is not present, replace the main PCB.
To help you with the right part numbers I need you to post the complete model number of the raised vent.
Good luck.
Gene.